Boku no Chikyuu wo Mamotte: Kin-iro no Toki Nagarete

ぼくの地球を守って　ミュージック・イメージ・ビデオ〜金色の時流れて

Please Save My Earth Music Image Video: The Passing of the Golden Age contains six music videos with footage not seen in the OVA and scenes taken from the manga, as well as a slightly different version of the OVA ending sequence, and the ending credits for the image videos. (Source: Wikipedia)